Very old version of PyYAML

[perlpunk]

I think it should at least be stated on the website that this is using a very old version of PyYAML, seemingly 3.10?
There have been quite some bug fixes since 3.10.

Also as an alternative I can recommend https://play.yaml.io/main/parser for testing many YAML libraries at once.
You need to run a container for this on your machine, but the steps to run it are very easy.
Maybe you could add a link to it?